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Overview
Comment: | More index tweaks -- not done yet. |
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Downloads: | Tarball | ZIP archive |
Timelines: | family | ancestors | descendants | both | sourceforge |
Files: | files | file ages | folders |
SHA1: |
cb20e39503f7103d2eebbe00a7e58b14 |
User & Date: | rmsimpson 2006-02-17 06:06:10.000 |
Context
2006-02-17
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06:06 | Platform compatibility changes check-in: 2253540b75 user: rmsimpson tags: sourceforge | |
06:06 | More index tweaks -- not done yet. check-in: cb20e39503 user: rmsimpson tags: sourceforge | |
2006-02-15
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05:40 | no message check-in: 4aaa3c5cf6 user: rmsimpson tags: sourceforge | |
Changes
Changes to System.Data.SQLite/SQLiteConnection.cs.
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1049 1050 1051 1052 1053 1054 1055 | /// <param name="strTable">The table to retrieve index information for, can be null</param> /// <returns>DataTable</returns> private DataTable Schema_Indexes(string strCatalog, string strTable, string strIndex) { DataTable tbl = new DataTable("Indexes"); DataRow row; DataTable tblSchema; | | > | 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 | /// <param name="strTable">The table to retrieve index information for, can be null</param> /// <returns>DataTable</returns> private DataTable Schema_Indexes(string strCatalog, string strTable, string strIndex) { DataTable tbl = new DataTable("Indexes"); DataRow row; DataTable tblSchema; Collections.Generic.List<int> primaryKeys = new List<int>(); bool maybeRowId; tbl.Locale = CultureInfo.InvariantCulture; tbl.Columns.Add("TABLE_CATALOG", typeof(string)); tbl.Columns.Add("TABLE_SCHEMA", typeof(string)); tbl.Columns.Add("TABLE_NAME", typeof(string)); tbl.Columns.Add("INDEX_CATALOG", typeof(string)); tbl.Columns.Add("INDEX_SCHEMA", typeof(string)); |
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1088 1089 1090 1091 1092 1093 1094 | using (SQLiteCommand cmdTables = new SQLiteCommand(String.Format(CultureInfo.InvariantCulture, "SELECT * FROM [{0}].[sqlite_master] WHERE [type] LIKE 'table'", strCatalog), this)) { using (SQLiteDataReader rdTables = cmdTables.ExecuteReader()) { while (rdTables.Read()) { | > | < | < < < < < | < < < > > > | > > | > > > > > > | > > | 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 | using (SQLiteCommand cmdTables = new SQLiteCommand(String.Format(CultureInfo.InvariantCulture, "SELECT * FROM [{0}].[sqlite_master] WHERE [type] LIKE 'table'", strCatalog), this)) { using (SQLiteDataReader rdTables = cmdTables.ExecuteReader()) { while (rdTables.Read()) { maybeRowId = false; primaryKeys.Clear(); if (String.IsNullOrEmpty(strTable) || String.Compare(rdTables.GetString(2), strTable, true, CultureInfo.InvariantCulture) == 0) { // First, look for any rowid indexes -- which sqlite defines are INTEGER PRIMARY KEY columns. // Such indexes are not listed in the indexes list but count as indexes just the same. using (SQLiteCommand cmdTable = new SQLiteCommand(String.Format(CultureInfo.InvariantCulture, "SELECT * FROM [{0}].[{1}]", strCatalog, rdTables.GetString(2)), this)) { using (SQLiteDataReader rdTable = cmdTable.ExecuteReader(CommandBehavior.SchemaOnly)) { tblSchema = rdTable.GetSchemaTable(false); foreach (DataRow schemaRow in tblSchema.Rows) { if (schemaRow.IsNull("DeclaredType") == false) { if ((bool)schemaRow[SchemaTableColumn.IsKey] == true) { primaryKeys.Add((int)schemaRow[SchemaTableColumn.ColumnOrdinal]); // If the primary key is of type INTEGER, then its a rowid and we need to make a fake index entry for it. if (String.Compare((string)schemaRow["DeclaredType"], "INTEGER", true, CultureInfo.InvariantCulture) == 0) { maybeRowId = true; } } } } if (primaryKeys.Count == 1 && maybeRowId == true) { row = tbl.NewRow(); row["TABLE_CATALOG"] = strCatalog; row["TABLE_NAME"] = rdTables.GetString(2); row["INDEX_CATALOG"] = strCatalog; row["PRIMARY_KEY"] = true; row["INDEX_NAME"] = String.Format(CultureInfo.InvariantCulture, "sqlite_master_PK_{0}", rdTables.GetString(2)); row["UNIQUE"] = true; tbl.Rows.Add(row); primaryKeys.Clear(); } } } // Now fetch all the rest of the indexes. using (SQLiteCommand cmd = new SQLiteCommand(String.Format(CultureInfo.InvariantCulture, "PRAGMA [{0}].index_list([{1}])", strCatalog, rdTables.GetString(2)), this)) { |
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1144 1145 1146 1147 1148 1149 1150 | row = tbl.NewRow(); row["TABLE_CATALOG"] = strCatalog; row["TABLE_NAME"] = rdTables.GetString(2); row["INDEX_CATALOG"] = strCatalog; row["INDEX_NAME"] = rd.GetString(1); row["UNIQUE"] = rd.GetBoolean(2); | > | > > > | > > > > > > > > > > > > > > > > > | > > > > > | 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 | row = tbl.NewRow(); row["TABLE_CATALOG"] = strCatalog; row["TABLE_NAME"] = rdTables.GetString(2); row["INDEX_CATALOG"] = strCatalog; row["INDEX_NAME"] = rd.GetString(1); row["UNIQUE"] = rd.GetBoolean(2); row["PRIMARY_KEY"] = false; // Now for the really hard work. Figure out which index is the primary key index. // The only way to figure it out is to check if the index was an autoindex and if we have a non-rowid // primary key, and all the columns in the given index match the primary key columns if (primaryKeys.Count > 0 && rd.GetString(1).StartsWith("sqlite_autoindex_" + rdTables.GetString(2), StringComparison.InvariantCultureIgnoreCase) == true) { using (SQLiteCommand cmdDetails = new SQLiteCommand(String.Format(CultureInfo.InvariantCulture, "PRAGMA [{0}].index_info([{1}])", strCatalog, rd.GetString(1)), this)) { using (SQLiteDataReader rdDetails = cmdDetails.ExecuteReader()) { int nMatches = 0; while (rdDetails.Read()) { if (primaryKeys.Contains(rdDetails.GetInt32(1)) == false) { nMatches = 0; break; } nMatches++; } if (nMatches == primaryKeys.Count) { row["PRIMARY_KEY"] = true; primaryKeys.Clear(); } } } } tbl.Rows.Add(row); } } } } } |
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